Ada:案例子集共享一个公共属性的变体记录
我有以下代码,其中我只希望前两个案例共享一个公共财产;但是,当我尝试使用此语法时,我发现错误Ada:案例子集共享一个公共属性的变体记录,ada,Ada,我有以下代码,其中我只希望前两个案例共享一个公共财产;但是,当我尝试使用此语法时,我发现错误“id”与第11行的声明冲突: type Shape (Which : Shape_Type := SQUARE) is record case Which is when Square => id : Natural; -- Line 11 when Turnout => i
“id”与第11行的声明冲突:
type Shape (Which : Shape_Type := SQUARE) is
record
case Which is
when Square =>
id : Natural; -- Line 11
when Turnout =>
id : Natural; -- Line that causes error to be thrown
when Invalid =>
null;
end case;
end record;
这:
如果以后希望案例
有一个额外属性,可以使用嵌套的案例
(但仍然需要涵盖所有备选方案):
+1套套管;我不知道你能做到这一点,但它看起来很棒/聪明(从好的方面来说,而不是抓你的头/WTF-was-I-thinking在6个月内踢你自己)。
type Shape (Which : Shape_Type := SQUARE) is
record
case Which is
when Square | Turnout =>
id : Natural;
when Invalid =>
null;
end case;
end record;
type Shape (Which : Shape_Type := SQUARE) is
record
case Which is
when Square | Turnout =>
id : Natural;
case Which is
when Square =>
null;
when Turnout =>
Deg : Natural;
when Invalid =>
null;
end case;
when Invalid =>
null;
end case;
end record;